Thousands of HSBC customers in the UK experienced disruptions in accessing online and mobile banking services, affecting their ability to authorize online card purchases on Black Friday. Customer complaints started around 07:00 GMT, with numerous reports on the Downdetector website. By 11:00 GMT, HSBC acknowledged the disruption on Twitter, apologizing for the inconvenience and suggesting the use of one-time passcodes via SMS for online card purchases. As of 13:20 GMT, no further updates were provided, with HSBC citing an internal system issue. The outage, occurring on Black Friday, may impact essential payments and shopping activities for affected customers.